http://stackoverflow.com/questions/7905025/string-could-not-resolved-error-in-eclipse-for-c-eclipse-cant-resolve-stan/9182742#9182742
mingw的include的路径与过程
http://www.mingw.org/wiki/includepathhowto
图文不错
https://my.oschina.net/leejun2005/blog/412924
cfree5, 自带mingw
http://www.programarts.com/cfree_ch/download.htm